: Open Ryujinx, go to File > Open Ryujinx Folder , and place your prod.keys file in the system folder.
The emulator will no longer show a "Missing Keys" or "Missing Firmware" error upon startup. Download switch bios v15 bin
After placing the files, restart your emulator. If the "BIOS" is installed correctly: : Open Ryujinx, go to File > Open